Synchronous primary mucinous adenocarcinomas in the descending colon and perianal glands.

The descending colon is a relatively rare site for mucinous adenocarcinoma. Anal ductal malignancy and multiple primary coloperianal mucinous adenocarcinomas are also rare. We have described the unusual finding of multiple primary synchronous mucinous adenocarcinomas in the descending colon and perianal glands. There was no evidence of any metastasis from the Dukes B lesion in the descending colon.